Gas discharge lamp ballast



FIG. 1 is a front and upper right perspective view showing our design;

FIG. 2 is a rear view;

FIG. 3 is a bottom plan view; and,

FIG. 4 is a left side elevation view.

The broken line showing is included only for the purpose of illustrating environmental elements only and forms no part of the claimed design. 

The ornamental design for a gas discharge lamp ballast, as shown and described. 